If the second amendment were incorporated, they'd have a case. But as in US v. CRUIKSHANK, 92 U.S. 542 (1875), and others, the courts have ruled that:
"The second amendment declares that it shall not be infringed; but this, as has been seen, means no more than that it shall not be infringed by Congress. This is one of the amendments that has no other effect than to restrict the powers of the national government ..."
The local government is bound by the state constitution in matters of gun legislation. Since the California state constitution is mute on the RKBA, legislators are free to pass any gun law they feel they can get away with without being voted out of office.
One minute you are saying that the Second Amendment prohibits the federal government from disarming state militias which no longer exist.
Now you suggest that the Second Amendment could be "incorporated" and that then the Nordykes would have a case. The Nordykes are not a state militia. They are people.